LD泵浦翠绿宝石晶体实现760 nm、10.5 W激光输出

10.5 W Laser Output at 760 nm From LD Pumped Alexandrite Crystal

翠绿宝石是性能优良的宽带可调谐激光晶体,具有荧光寿命长、饱和能量密度高、吸收带宽较宽以及热力学性能优良等诸多优点。翠绿宝石晶体独特的吸收带表明除了使用闪光灯泵浦,还可以使用蓝光激光二极管(LD)、绿光激光器、黄光激光器、红光LD等多种可见光光源作为泵浦源。其中,基于日渐成熟的高功率红光LD泵浦源的翠绿宝石激光器具有效率高、体积小等优势,逐渐成为固体激光领域的研究热点。利用两台光纤耦合输出的638 nm高功率LD作为泵浦源,使用双端偏振泵浦结构对翠绿宝石晶体进行抽运,实现了中心波长为760 nm、功率达10.5 W的可见光波段激光输出,光-光转换效率为20%。这是目前国内利用红光LD泵浦翠绿宝石晶体实现的最高输出功率。

Alexandrite is an excellent broadband tunable laser crystal with many advantages, such as long fluorescence lifetime, high saturation energy density, wide absorption bandwidth, and excellent thermodynamic properties. The unique absorption band of alexandrite crystals shows that besides flash lamp, many visible light sources such as the blue laser diode (LD), green laser, yellow laser, and red LD can be used as pump sources. Among them, the alexandrite laser based on the mature high-power red LD pump source has the advantages of high efficiency and small volume, and has gradually become a hot topic in the field of solid-state laser. Using two fiber-coupled 638 nm high-power LDs as the pump source, a double-ended polarization pumping structure is used to pump the alexandrite crystal to achieve a visible light waveband laser output with a center wavelength of 760 nm and a power of 10.5 W. The optical-to-optical conversion efficiency is 20%. This is currently the highest output power realized by red-diode-pumped alexandrite crystals in domestic researches.